词
础的;The dorsoventral polarity of Drosophila egg is established by means of signaling between the germ line-derived oocyte and the surrounding somatic follicle cells.
果蝇胚胎的发育是由四种系统，分别控制头尾
、前、后
背腹的形成。
The dorsoventral polarity of Drosophila egg is established by means of signaling between the germ line-derived oocyte and the surrounding somatic follicle cells.
果蝇胚胎的发育是由四种系统，分别控制头尾、前、后背腹的形成。
In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.
后段的背腹径最长，可分为背侧和腹侧，两分的细胞分界清晰。
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